<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>06-盒子模型-单方向边框线</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: skyblue;

            border-top: 10px solid #000;
            border-left: 5px dashed #999;
            border-right: 5px dotted red;
            border-bottom: 5px solid green;
        }
    </style>
</head>
<body>
    <h1>单方向边框线</h1>
    <div>这是个盒子</div>
</body>
</html>